In the last weeks before election day, the race for Maricopa County Sheriff is far from decided. While the long-serving Joe Arpaio still appears to be in the lead, one of his opponents has gained momentum, and the other is railing against charges that his candidacy is a sham.

As Election Day approaches, voter fraud is a high-priority issue. Tuesday, a Pennsylvania judge blocked that state's voter ID law. Last week, the national Republican Party fired an Arizona company that organized get-out-the-vote drives in swing states over suspicious registration forms.

The United States has a long and checkered history when it comes to the ballot box. In the last several years, the issue of voter fraud has become a rallying cry in local, state, and national elections.